Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
135/90r17 vs 155/80r17 Tire Comparison Side By Side
  135/90-17 155/80-17 Difference
Diameter inches (mm) 26.57 (674.8) 26.76 (679.8) 0.2 (5) 0.7%
Width inches (mm) 5.31 (135) 6.1 (155) 0.79 (20) 14.8%
Circum. inches (mm) 83.46 (2119.95) 84.08 (2135.65) 0.62 (15.71) 0.7%
Sidewall Height inches (mm) 4.78 (121.5) 4.88 (124) 0.1 (2.5) 2.1%
Revolutions per mile (km) 759.14 (471.71) 753.56 (468.24) -5.58 (-3.47) -0.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.15 mph (32.43 km/h)
25 mph (40.23 km/h)25.19 mph (40.53 km/h)
30 mph (48.28 km/h)30.22 mph (48.64 km/h)
35 mph (56.33 km/h)35.26 mph (56.74 km/h)
40 mph (64.37 km/h)40.3 mph (64.85 km/h)
45 mph (72.42 km/h)45.33 mph (72.96 km/h)
50 mph (80.47 km/h)50.37 mph (81.06 km/h)
55 mph (88.51 km/h)55.41 mph (89.17 km/h)
60 mph (96.56 km/h)60.44 mph (97.28 km/h)
65 mph (104.61 km/h)65.48 mph (105.38 km/h)
70 mph (112.65 km/h)70.52 mph (113.49 km/h)
75 mph (120.7 km/h)75.56 mph (121.6 km/h)
80 mph (128.75 km/h)80.59 mph (129.7 km/h)
85 mph (136.79 km/h)85.63 mph (137.81 km/h)
90 mph (144.84 km/h)90.67 mph (145.91 km/h)
95 mph (152.89 km/h)95.7 mph (154.02 km/h)
100 mph (160.93 km/h)100.74 mph (162.13 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
2.35 2.73 2.94 3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17
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